samples/bpf/test_map_in_map_user.c

   1 /*
   2  * Copyright (c) 2017 Facebook
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of version 2 of the GNU General Public
   6  * License as published by the Free Software Foundation.
   7  */
   8 #include <sys/resource.h>
   9 #include <sys/socket.h>
  10 #include <arpa/inet.h>
  11 #include <stdint.h>
  12 #include <assert.h>
  13 #include <errno.h>
  14 #include <stdlib.h>
  15 #include <stdio.h>
  16 #include <bpf/bpf.h>
  17 #include "bpf_load.h"
  18
  19 #define PORT_A          (map_fd[0])
  20 #define PORT_H          (map_fd[1])
  21 #define REG_RESULT_H    (map_fd[2])
  22 #define INLINE_RESULT_H (map_fd[3])
  23 #define A_OF_PORT_A     (map_fd[4]) /* Test case #0 */
  24 #define H_OF_PORT_A     (map_fd[5]) /* Test case #1 */
  25 #define H_OF_PORT_H     (map_fd[6]) /* Test case #2 */
  26
  27 static const char * const test_names[] = {
  28         "Array of Array",
  29         "Hash of Array",
  30         "Hash of Hash",
  31 };
  32
  33 #define NR_TESTS (sizeof(test_names) / sizeof(*test_names))
  34
  35 static void check_map_id(int inner_map_fd, int map_in_map_fd, uint32_t key)
  36 {
  37         struct bpf_map_info info = {};
  38         uint32_t info_len = sizeof(info);
  39         int ret, id;
  40
  41         ret = bpf_obj_get_info_by_fd(inner_map_fd, &info, &info_len);
  42         assert(!ret);
  43
  44         ret = bpf_map_lookup_elem(map_in_map_fd, &key, &id);
  45         assert(!ret);
  46         assert(id == info.id);
  47 }
  48
  49 static void populate_map(uint32_t port_key, int magic_result)
  50 {
  51         int ret;
  52
  53         ret = bpf_map_update_elem(PORT_A, &port_key, &magic_result, BPF_ANY);
  54         assert(!ret);
  55
  56         ret = bpf_map_update_elem(PORT_H, &port_key, &magic_result,
  57                                   BPF_NOEXIST);
  58         assert(!ret);
  59
  60         ret = bpf_map_update_elem(A_OF_PORT_A, &port_key, &PORT_A, BPF_ANY);
  61         assert(!ret);
  62         check_map_id(PORT_A, A_OF_PORT_A, port_key);
  63
  64         ret = bpf_map_update_elem(H_OF_PORT_A, &port_key, &PORT_A, BPF_NOEXIST);
  65         assert(!ret);
  66         check_map_id(PORT_A, H_OF_PORT_A, port_key);
  67
  68         ret = bpf_map_update_elem(H_OF_PORT_H, &port_key, &PORT_H, BPF_NOEXIST);
  69         assert(!ret);
  70         check_map_id(PORT_H, H_OF_PORT_H, port_key);
  71 }
  72
  73 static void test_map_in_map(void)
  74 {
  75         struct sockaddr_in6 in6 = { .sin6_family = AF_INET6 };
  76         uint32_t result_key = 0, port_key;
  77         int result, inline_result;
  78         int magic_result = 0xfaceb00c;
  79         int ret;
  80         int i;
  81
  82         port_key = rand() & 0x00FF;
  83         populate_map(port_key, magic_result);
  84
  85         in6.sin6_addr.s6_addr16[0] = 0xdead;
  86         in6.sin6_addr.s6_addr16[1] = 0xbeef;
  87         in6.sin6_port = port_key;
  88
  89         for (i = 0; i < NR_TESTS; i++) {
  90                 printf("%s: ", test_names[i]);
  91
  92                 in6.sin6_addr.s6_addr16[7] = i;
  93                 ret = connect(-1, (struct sockaddr *)&in6, sizeof(in6));
  94                 assert(ret == -1 && errno == EBADF);
  95
  96                 ret = bpf_map_lookup_elem(REG_RESULT_H, &result_key, &result);
  97                 assert(!ret);
  98
  99                 ret = bpf_map_lookup_elem(INLINE_RESULT_H, &result_key,
 100                                           &inline_result);
 101                 assert(!ret);
 102
 103                 if (result != magic_result || inline_result != magic_result) {
 104                         printf("Error. result:%d inline_result:%d\n",
 105                                result, inline_result);
 106                         exit(1);
 107                 }
 108
 109                 bpf_map_delete_elem(REG_RESULT_H, &result_key);
 110                 bpf_map_delete_elem(INLINE_RESULT_H, &result_key);
 111
 112                 printf("Pass\n");
 113         }
 114 }
 115
 116 int main(int argc, char **argv)
 117 {
 118         struct rlimit r = {RLIM_INFINITY, RLIM_INFINITY};
 119         char filename[256];
 120
 121         assert(!setrlimit(RLIMIT_MEMLOCK, &r));
 122
 123         snprintf(filename, sizeof(filename), "%s_kern.o", argv[0]);
 124
 125         if (load_bpf_file(filename)) {
 126                 printf("%s", bpf_log_buf);
 127                 return 1;
 128         }
 129
 130         test_map_in_map();
 131
 132         return 0;
 133 }